/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lib_qrcode.zxing.camera;

import android.hardware.Camera;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

final class AutoFocusCallback implements Camera.AutoFocusCallback
{

	private static final String TAG = AutoFocusCallback.class.getSimpleName();

	private static final long AUTOFOCUS_INTERVAL_MS = 1500L;

	private Handler autoFocusHandler;
	private int autoFocusMessage;

	void setHandler(Handler autoFocusHandler, int autoFocusMessage)
	{
		this.autoFocusHandler = autoFocusHandler;
		this.autoFocusMessage = autoFocusMessage;
	}

	public void onAutoFocus(boolean success, Camera camera)
	{
		if (autoFocusHandler != null)
		{
			Message message = autoFocusHandler.obtainMessage(autoFocusMessage, success);
			// Simulate continuous autofocus by sending a focus request every
			// AUTOFOCUS_INTERVAL_MS milliseconds.
			// Log.d(TAG, "Got auto-focus callback; requesting another");
			autoFocusHandler.sendMessageDelayed(message, AUTOFOCUS_INTERVAL_MS);
			autoFocusHandler = null;
		}
		else
		{
			Log.d(TAG, "Got auto-focus callback, but no handler for it");
		}
	}

}
